If you have another iDevice with the same iOS version, you can use it as a guide to bring you back. While the command titles will have changed due to the updated language settings, the location within the menus will remain the same.

In this case, go through the following step by step on both devices to switch back to English:

Settings > General > Country Settings > Language

As @bneely notes, Google Translate can also be a very handy tool to figure out exactly what a particular phrase means.